Need female advice using my sisters glow

My sister suggested I get extra female advice about this so here I am posting on my sisters glow account. Basically I’m here because about two years ago I met this girl she was nice we got introduced to each other with means of becoming more than friends but I was a musician and she was a singer so that’s why we were put together in our church. My brother is her age and I’m 4 years older than her and my brother, so when he met her he liked her but I didn’t tell him I was interested in her

Months go by and since we’re spending a lot of time together practicing and singing I start to develop feelings for her but my younger brother is in the middle of wooing her

So I step back and I let him have her and almost a year after meeting each other they finally make their relationship official and I’m ok with it and decide it’s for the best

We are still friends, and after she’s my brothers girlfriend we actually become best friends. She is the first person I feel I can truly trust and she trusts me a lot too. Nearly a year goes by and we’re very comfortable with each other and we both love my brother and care for him a lot, but she decides to open up to me about her feelings and she tells me that sometimes it’s hard for her to remember where the just friends line is and being careful not to cross to the more than friends

But the problem was I felt the same way and even tho we admitted to this we had an even closer bond and it became even harder to remain in the just friends zone

My brother suspects maybe we have something going on but we could never do anything to hurt him me love him a lot and I know sometimes when we’re alone together things get weird but we always bring him up just to remind. Us were just friends.